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Proceedings Paper

Single-mode regime of 19-cell Yb-doped double-cladding photonic crystal fibers
Author(s): Enrico Coscelli; Federica Poli; Thomas T. Alkeskjold; Davide Passaro; Annamaria Cucinotta; Stefano Selleri; Lasse Leick; Jes Broeng
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Paper Abstract

The single-mode regime of 19-cell Yb-doped double-cladding photonic crystal fibers, successfully exploited for high-power applications due to their large mode area, has been studied. The first higher-order mode cut-off wavelength has been evaluated taking into account the crossing between its dispersion curve, obtained with a full-vector modal solver based on the finite element method, and the one of the fundamental space-filling mode, calculated for an infinite cladding. Moreover, the overlap integral on the doped core of the higher-order mode at cut-off condition has been calculated, in order to investigate its effective suppression in the gain competition with the fundamental mode, by applying a spatial and spectral amplifier model. 19-cell double-cladding photonic crystal fibers with different core diameter and refractive index values have been considered. Simulation results have shown that the approach based on the fundamental space-filling mode effective index is not suitable for the cut-off analysis of large core fibers with a finite cladding dimension.

Paper Details

Date Published: 10 February 2011
PDF: 7 pages
Proc. SPIE 7914, Fiber Lasers VIII: Technology, Systems, and Applications, 79141V (10 February 2011); doi: 10.1117/12.873711
Show Author Affiliations
Enrico Coscelli, Univ. of Parma (Italy)
Federica Poli, Univ. of Parma (Italy)
Thomas T. Alkeskjold, NKT Photonics A/S (Denmark)
Davide Passaro, Univ. of Parma (Italy)
Annamaria Cucinotta, Univ. of Parma (Italy)
Stefano Selleri, Univ. of Parma (Italy)
Lasse Leick, NKT Photonics A/S (Denmark)
Jes Broeng, NKT Photonics A/S (Denmark)

Published in SPIE Proceedings Vol. 7914:
Fiber Lasers VIII: Technology, Systems, and Applications
Jay W. Dawson, Editor(s)

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